Pump cross-head.



A. K. KING 3; J. W. IRWIN.

PUM 0S3 HEAD.

I APPLIOATIO LED MAY 31, 1911. 1,023,855. Patented Apr. 23, 1912.

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- i and UNITED STATES. PATENT orrion ALBERT K. KING AND JAMES W. IRWIN, OF MARICOPA, CALIFORNIA.

PUMP GROSS-HEAD.

To all whom it may concern Be it known that we, ALBERT K. KING and Janus W. IRWIN, citizens of the United States, residing at Maricopa, in the county of Kern and State of California, have invented new and useful Improvements in Pump Cross-Heads, of which the following is a specification.

This invention relates to a crosshead for a pump of the character generally known as a steam pump and the invention has particularly to do with a device arranged to be easily removed and replaced on the piston rod without removing the piston rod or disturbing the pump in any manner.

I-Ieretofore, so far as we are aware, crossheads have been of such configuration that they must either be removed over the end of the rod, or the rocker arm must be moved to disengage the crosshead, or, in most cases, both must be done. This necessitates removing the rod from the pump and, sometimes, removing the pistons and a good many of the movable parts.

It is the object of our invention to provide a device easily placed on the piston rod of a pump and removed therefrom, if necessary, without disturbing the piston rod or rocker arm; this crosshead being used in the ordinary manner for engagement by the oscillating rocker arm mounted on the valve rock shaft.

The accompanying drawings illustrate a typical form of our invention as applied to a common form of steam pump; variations in the form of our invention to suit other forms of pumps will suggest themselves.

In these drawings: Figure 1 is a side elevation of a pump equipped with our improved device. Fig. 2 is an enlarged side elevation of the device. Fig. 3 is an end elevation of the device.

In the drawings 5 designates a steam pump of ordinary construction having steam end 6 and water end 7 The mechanism of the steam end 6 is controlled by a slide or other type of valve moved through the medium of a valve rod 8 which is moved from a rock shaft 9. An arm 10 is mounted on rock shaft 9 and depends to a point close to piston rod 11. Piston rod 11 has the ordinary reciprocating motion and our improved device 12 is placed on the piston rod to partake of that motion.

Our device comprises two portions 18 and 14 adapted to be clamped or secured Specification of Letters Patent.

Application filed May 31, 1911.

Patented Apr. 23, 1912.

Serial No. 630,376.

around piston rod 11 by means of bolts 15 passing through member 14 and screwing into member 13. The bolts 15 are preferably four in number and their heads 15 project on the outside of our device so as to be readily reached in case of removal. Member 14 is provided with a transverse groove 16 onits face, in which groove the enlarged end 10 of arm 10 is adapted to move. End 10 is preferably made with circular surfaces which engage movably and slidably with surfaces 16 on each side of groove 16. The circular form of end 10 allows the reciprocation of our device 12 to cause oscillation of arm 10, also allowing the end of the arm to move in a transverse direction, or longitudinally of the groove 16. A prime feature of our improvement is the making of the device in two halves removably secured together and of such configuration as to be easily removed without disturbing the rocker arm. We have shown bolts as securing means; but other means which will clamp the two members around piston rod 11 may be used as well. The main advantage resides in the ease with which our crosshead may be removed from the piston rod, it only being necessary to remove bolts 15 when the halves may be removed from the rod for repair, replacement or any other necessary operation. This is done by turning the half 14 through a quarter revolution in the direction indicated, when the part may he slipped along the rod 11 from beneath the rocker arm. This turns the curved surface 16 and the side surface 14 beneath the rocker arm. Surface 14 is closer to the rod 11 than is surface 14 in which groove 16 is cut; so that surface 14 may be closer to the rod 11 than is the rocker arm 10. Ordinarily the rocker arm must be moved longitudinally on its shaft 9 so as to clear the crosshead to allow its removal; but in our case no parts are moved except the crosshead itself. Thus it will be seen that the portion 14 is the essential part of our device; while portion 13 is merely a means of securing portion 14 to the piston rod. Although it is preferred to thus clamp the member 14 to the rod, it is possible to secure it in other manners.

Having described'our invention, we claim; 1. In combination with a pump having a reciprocating piston rod and an arm adapted to be moved by the reciprocation of the piston rod, a crosshead comprising a member adapted to be secured on the piston rod and having a pair of outer surfaces at unequal distances from the center of the rod, a transverse groove in the surface farther from the rod, the bottom of the groove curving around the member to the surface closer to the rod, and means for securing the member to the rod.

2. In combination With a pump having a reciprocating piston rod and an arm adapted to be moved by the reciprocation of the piston rod, a crosshead comprising a pair of members adapted to be clamped around the piston rod one of said members having a pair of outer surfaces at unequal distances from the center of the rod, a transverse groove in the surface farther from the rod, the bottom of the groove curving around the member to the surface closer to the rod, and bolts for securing the two members 20 around the rod.

In Witness that We claim the foregoing We have hereunto subscribed our names this 22d day of May 1911.

ALBERT K. KING. JAMES W. IRWIN.

Witnesses:

M. M. DoWELL, M. CAMPBELL.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. C. 

